I am in the process of buying a 02 wrx w/115K miles for $2200, but here's the catch. It has a knocking motor, so i'm trying to clear some things up since i would like to put a sti short block in, instead of another 2.0L.

I take it that i can swap the heads right over from my 2.0L to the sti block, but i am curious in what year block that i need for this swap to go smoothly. also what block i would need that would handle some boost, since i do believe there is a few upgrades on this car already.

it have a full HKS exhaust, K&N air filter setup, much bigger TMIC, Aluminum radiator, Turbo timer, and looks like a brand new turbo.. is there anything else i may need for the 2.5L swap?

I was told that once you split the block then it would be hard to put it all back together right. i was wondering with the sti block and wrx trans, would the sti flywheel fit into the trans just fine or would i have to grind the inside out a lil bit?

I found a receipt in the glove box saying that the tranny was rebuilt at 20K miles, but for what reason i don't know. i just found a EJ257 block for a 07 STI to go into my car for 1900. the question is do i really want to buy the oem flywheel for that motor or should i get a lightweight flywheel?

Anyone know where i may be able to get and inexpensive 6spd tranny for this car?
I was told everything will switch over and all i have to do is plug a port on top of the block....i think it's the ari port or something like that....anyone know what they're talking about?

alright well i guess i'll just try not to boost this motor too much...anyone know if the wrx flywheel will fit on the ej257 or do i need to get an oem one. also will the flywheel fit fine into the 5spd tranny or do i need to do some modifications.

I was looking into some forged kits that come with pistons, rod, wrist pins and rings, but is there a specific one that would be worth the time and money? i have an option between je, cp, wiseco, and cosworth. i believe the je forged pistons are 800 for the kit, or doi really need to do all this with the 07 motor?

I just wanna get everything straightened out so when everything is order it all comes out right, and i don't like doing jobs twice, so i want to get everything right the first time and i really appreciate all the help i've gotten from everyone thus far.

The flywheel and all clutch components for a WRX 2.0 will work. Rods are unecassary, but good insurance. I personally did not worry about them, I've not heard of them failing often. Pistons on the other hand... definitely. CP is what I used, and I like them... they're doing their job.